Someone on another board suggested longer bolts thru the rotor mounting holes might jimmy it off, and that worked. There are a lot of tight fit diameters, dowels and studs that keep it in place and all that stuff just makes it difficult to get off.
Unfortunately, what I found underneath is ugly. It appears the bearing suffered a failure - don't know why, maybe just age because I serviced it more often than the maintenance schedule. The bearing cage started to disintegrate and several balls are missing and apparently somewhere inside the case. This debris then tore up the seal. It would take a total tear down, and probably every rotating part, including the gears, would need replaced.
So I just receive the used drive and it appears to be in good shape.
If anyone has any tips to installing one of these, I'm all ears.
Keep on Tourin'